[R] How do I multiply labeled vectors of numbers?
jholtman at gmail.com
Thu Dec 11 00:20:39 CET 2008
Sent from my iPhone
On Dec 10, 2008, at 15:17, "Bill McNeill (UW)"
<billmcn at u.washington.edu> wrote:
> I'm an R newbie trying to do an operation that seems like it should
> be very
> simple, but after much playing around with the interface and reading
> Introduction to R" I can figure out how to do it.
> I have two text files. File1 contains:
> type n
> dog 2
> cat 4
> horse 6
> File2 contains:
> type n
> horse 1
> dog 3
> cat 9
> mouse 11
> I want to read both files into R and multiply corresponding values
> of n so
> that I end up with:
> dog 2*3 = 6
> cat 4*9 = 36
> horse 6*1 = 6
> mouse 0*11 = 0
> Note that the type rows are not necessarily in the same order in the
> files, and that a missing type gets a default n = 0 value.
> I figure the way to do this is use read.table and do the appropriate
> manipulation of the factors, but I can't figure out what those
> would be. Basically I want to use a factor table as a hash table,
> but I
> haven't been able to figure out how to do this, which makes me think
> I'm not
> conceptualizing this is the correct R-ish way.
> Bill McNeill
> [[alternative HTML version deleted]]
> R-help at r-project.org mailing list
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> and provide commented, minimal, self-contained, reproducible code.
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